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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
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Statement of Financial Position [Abstract] |  |
Allowance for credit losses on loans | $ 170,189 | $ 166,955
Goodwill | $ 302,707 | $ 302,707
Common stock, par value (in dollars per share) | $ 1.00 | $ 1.00
Common stock, shares authorized (in shares) | 300,000,000 | 300,000,000
Common stock, shares issued (in shares) | 135,937,934 | 135,727,237
Common stock, shares outstanding (in shares) | 75,867,105 | 75,689,364
Treasury stock, shares (in shares) | 60,070,829 | 60,037,873

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